Helenis15yearsold,andJoanis15,too.SoHelenis

问题详情：

Helen is 15 years old, and Joan is 15, too. So Helen is ____ Joan.

            A. as big as       B. as older as    C. as old as                D. so old as

【回答】

C    考查as+形容词原级+as意为“与……一样……”。此处指年龄一样大，用old而

                 不用big。肯定句中用as ... as而不能用so ... as。故选C。

知识点：相似 相近词比较

题型：选择题